How to Lower Compression?
+ Reply to Thread
Results 1 to 3 of 3

Thread:
How to Lower Compression?

  1. #1
    Junior Member
    Join Date
    Jul 2013
    Posts
    2

    Default How to Lower Compression?

    Hey guys/gals
    I have a 588 NA motor (Dart Big M tall deck, 4.56 bore) with AFR 335 heads that is at 700hp on the dyno, compression is 10.5 to 1. I would like to see the motor more around 800-850hp, so I figured best bet would be to put a Whipple 3.3 on her, but compression is obviously to high. So, what would be the best method to get it down and what would be the best number to get it down to? Motor only has a few hours on her so prefer not to do a total rebuild. Am I screwed? Your thoughts?

    Thanks
    Frank

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member
    Join Date
    May 2008
    Posts
    779

    Default

    I know a thicker head gasket is a simple way to lower it, but I too would like to hear what the pro's think is the most acceptable way to do it.

  4. #3
    Some guy obnoxious001's Avatar
    Join Date
    Dec 2007
    Posts
    3,566

    Default

    Quote Originally Posted by PORT View Post
    Hey guys/gals
    I have a 588 NA motor (Dart Big M tall deck, 4.56 bore) with AFR 335 heads that is at 700hp on the dyno, compression is 10.5 to 1. I would like to see the motor more around 800-850hp, so I figured best bet would be to put a Whipple 3.3 on her, but compression is obviously to high. So, what would be the best method to get it down and what would be the best number to get it down to? Motor only has a few hours on her so prefer not to do a total rebuild. Am I screwed? Your thoughts?

    Thanks
    Frank
    I sent you a PM last week, since this column might not get looked at or answered the same as if you put it on the "dyno" section. Pro's are going to tell you what I did in the PM, you are going to need to change pistons to drop that much compression.

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95